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linux-next/drivers/thunderbolt/tb.h
Mika Westerberg 72ee33907b thunderbolt: Read vendor and device name from DROM
The device DROM contains name of the vendor and device among other
things. Extract this information and expose it to the userspace via two
new attributes.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-06-09 11:42:42 +02:00

350 lines
9.8 KiB
C

/*
* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#ifndef TB_H_
#define TB_H_
#include <linux/pci.h>
#include <linux/uuid.h>
#include "tb_regs.h"
#include "ctl.h"
/**
* struct tb_switch - a thunderbolt switch
* @dev: Device for the switch
* @config: Switch configuration
* @ports: Ports in this switch
* @tb: Pointer to the domain the switch belongs to
* @uid: Unique ID of the switch
* @uuid: UUID of the switch (or %NULL if not supported)
* @vendor: Vendor ID of the switch
* @device: Device ID of the switch
* @vendor_name: Name of the vendor (or %NULL if not known)
* @device_name: Name of the device (or %NULL if not known)
* @cap_plug_events: Offset to the plug events capability (%0 if not found)
* @is_unplugged: The switch is going away
* @drom: DROM of the switch (%NULL if not found)
*/
struct tb_switch {
struct device dev;
struct tb_regs_switch_header config;
struct tb_port *ports;
struct tb *tb;
u64 uid;
uuid_be *uuid;
u16 vendor;
u16 device;
const char *vendor_name;
const char *device_name;
int cap_plug_events;
bool is_unplugged;
u8 *drom;
};
/**
* struct tb_port - a thunderbolt port, part of a tb_switch
*/
struct tb_port {
struct tb_regs_port_header config;
struct tb_switch *sw;
struct tb_port *remote; /* remote port, NULL if not connected */
int cap_phy; /* offset, zero if not found */
u8 port; /* port number on switch */
bool disabled; /* disabled by eeprom */
struct tb_port *dual_link_port;
u8 link_nr:1;
};
/**
* struct tb_path_hop - routing information for a tb_path
*
* Hop configuration is always done on the IN port of a switch.
* in_port and out_port have to be on the same switch. Packets arriving on
* in_port with "hop" = in_hop_index will get routed to through out_port. The
* next hop to take (on out_port->remote) is determined by next_hop_index.
*
* in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
* port.
*/
struct tb_path_hop {
struct tb_port *in_port;
struct tb_port *out_port;
int in_hop_index;
int in_counter_index; /* write -1 to disable counters for this hop. */
int next_hop_index;
};
/**
* enum tb_path_port - path options mask
*/
enum tb_path_port {
TB_PATH_NONE = 0,
TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
TB_PATH_ALL = 7,
};
/**
* struct tb_path - a unidirectional path between two ports
*
* A path consists of a number of hops (see tb_path_hop). To establish a PCIe
* tunnel two paths have to be created between the two PCIe ports.
*
*/
struct tb_path {
struct tb *tb;
int nfc_credits; /* non flow controlled credits */
enum tb_path_port ingress_shared_buffer;
enum tb_path_port egress_shared_buffer;
enum tb_path_port ingress_fc_enable;
enum tb_path_port egress_fc_enable;
int priority:3;
int weight:4;
bool drop_packages;
bool activated;
struct tb_path_hop *hops;
int path_length; /* number of hops */
};
/**
* struct tb_cm_ops - Connection manager specific operations vector
* @start: Starts the domain
* @stop: Stops the domain
* @suspend_noirq: Connection manager specific suspend_noirq
* @resume_noirq: Connection manager specific resume_noirq
* @hotplug: Handle hotplug event
*/
struct tb_cm_ops {
int (*start)(struct tb *tb);
void (*stop)(struct tb *tb);
int (*suspend_noirq)(struct tb *tb);
int (*resume_noirq)(struct tb *tb);
hotplug_cb hotplug;
};
/**
* struct tb - main thunderbolt bus structure
* @dev: Domain device
* @lock: Big lock. Must be held when accessing cfg or any struct
* tb_switch / struct tb_port.
* @nhi: Pointer to the NHI structure
* @ctl: Control channel for this domain
* @wq: Ordered workqueue for all domain specific work
* @root_switch: Root switch of this domain
* @cm_ops: Connection manager specific operations vector
* @index: Linux assigned domain number
* @privdata: Private connection manager specific data
*/
struct tb {
struct device dev;
struct mutex lock;
struct tb_nhi *nhi;
struct tb_ctl *ctl;
struct workqueue_struct *wq;
struct tb_switch *root_switch;
const struct tb_cm_ops *cm_ops;
int index;
unsigned long privdata[0];
};
static inline void *tb_priv(struct tb *tb)
{
return (void *)tb->privdata;
}
/* helper functions & macros */
/**
* tb_upstream_port() - return the upstream port of a switch
*
* Every switch has an upstream port (for the root switch it is the NHI).
*
* During switch alloc/init tb_upstream_port()->remote may be NULL, even for
* non root switches (on the NHI port remote is always NULL).
*
* Return: Returns the upstream port of the switch.
*/
static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
{
return &sw->ports[sw->config.upstream_port_number];
}
static inline u64 tb_route(struct tb_switch *sw)
{
return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
}
static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_read(sw->tb->ctl,
buffer,
tb_route(sw),
0,
space,
offset,
length);
}
static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_write(sw->tb->ctl,
buffer,
tb_route(sw),
0,
space,
offset,
length);
}
static inline int tb_port_read(struct tb_port *port, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_read(port->sw->tb->ctl,
buffer,
tb_route(port->sw),
port->port,
space,
offset,
length);
}
static inline int tb_port_write(struct tb_port *port, const void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_write(port->sw->tb->ctl,
buffer,
tb_route(port->sw),
port->port,
space,
offset,
length);
}
#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define __TB_SW_PRINT(level, sw, fmt, arg...) \
do { \
struct tb_switch *__sw = (sw); \
level(__sw->tb, "%llx: " fmt, \
tb_route(__sw), ## arg); \
} while (0)
#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
do { \
struct tb_port *__port = (_port); \
level(__port->sw->tb, "%llx:%x: " fmt, \
tb_route(__port->sw), __port->port, ## arg); \
} while (0)
#define tb_port_WARN(port, fmt, arg...) \
__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
#define tb_port_warn(port, fmt, arg...) \
__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
#define tb_port_info(port, fmt, arg...) \
__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
struct tb *tb_probe(struct tb_nhi *nhi);
extern struct bus_type tb_bus_type;
extern struct device_type tb_domain_type;
extern struct device_type tb_switch_type;
int tb_domain_init(void);
void tb_domain_exit(void);
struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
int tb_domain_add(struct tb *tb);
void tb_domain_remove(struct tb *tb);
int tb_domain_suspend_noirq(struct tb *tb);
int tb_domain_resume_noirq(struct tb *tb);
static inline void tb_domain_put(struct tb *tb)
{
put_device(&tb->dev);
}
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
u64 route);
int tb_switch_configure(struct tb_switch *sw);
int tb_switch_add(struct tb_switch *sw);
void tb_switch_remove(struct tb_switch *sw);
void tb_switch_suspend(struct tb_switch *sw);
int tb_switch_resume(struct tb_switch *sw);
int tb_switch_reset(struct tb *tb, u64 route);
void tb_sw_set_unplugged(struct tb_switch *sw);
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
static inline void tb_switch_put(struct tb_switch *sw)
{
put_device(&sw->dev);
}
static inline bool tb_is_switch(const struct device *dev)
{
return dev->type == &tb_switch_type;
}
static inline struct tb_switch *tb_to_switch(struct device *dev)
{
if (tb_is_switch(dev))
return container_of(dev, struct tb_switch, dev);
return NULL;
}
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
int tb_port_add_nfc_credits(struct tb_port *port, int credits);
int tb_port_clear_counter(struct tb_port *port, int counter);
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
void tb_path_free(struct tb_path *path);
int tb_path_activate(struct tb_path *path);
void tb_path_deactivate(struct tb_path *path);
bool tb_path_is_invalid(struct tb_path *path);
int tb_drom_read(struct tb_switch *sw);
int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
static inline int tb_route_length(u64 route)
{
return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
}
static inline bool tb_is_upstream_port(struct tb_port *port)
{
return port == tb_upstream_port(port->sw);
}
/**
* tb_downstream_route() - get route to downstream switch
*
* Port must not be the upstream port (otherwise a loop is created).
*
* Return: Returns a route to the switch behind @port.
*/
static inline u64 tb_downstream_route(struct tb_port *port)
{
return tb_route(port->sw)
| ((u64) port->port << (port->sw->config.depth * 8));
}
#endif